/usr/share/applications/unity-2d-panel.desktop is in unity-2d-panel 5.12.0-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | [Desktop Entry]
Name=Unity 2D Panel
Comment=A Qt-based panel
Icon=gnome-fs-desktop
Exec=unity-2d-panel
Terminal=false
Type=Application
Categories=Utility;
NoDisplay=true
X-Ubuntu-Gettext-Domain=unity-2d-panel
X-GNOME-Autostart-Notify=false
X-GNOME-Autostart-Phase=Panel
X-GNOME-AutoRestart=true
|